/Engine/Source/Editor/VREditor/Public/VREditorBaseActor.h
Get a relative transform from the hand
FTransform MakeUITransformLockedToHand ( class [UViewportInteractor](API\Editor\ViewportInteraction\UViewportInteractor) * Interactor, const bool bOnArm, const FVector & InRelativeOffset, const FRotator & InLocalRotation )